.show_msg {
  width: 100%;
  height: 1.6rem;
  text-align: center;
  position: fixed;
  left: 0;
  z-index: 999;
}
.show_span {
  display: inline-block;
  height: 1.6rem;
  padding: 0 1rem;
  line-height: 1.6rem;
  background: rgba(0, 0, 0, 0.8);
  border-radius: .8rem;
  color: #fff;
  font-size: 0.6875rem;
}
